Hi, I'm new here and want to get into Photography. I usually pick things up pretty quickly. I don't have a camera now, and have never fully used a high end film camera. I would like to get a good Digital, like maybe a Canon A570 style camera. Do I need to read up on aperture and stuff like that before I buy something like this? When I looked at them at the store, they didn't seem that difficult. Thanks in advance.